Spiky Leaf Beetle (Dactylispa sp., subfamily Hispinae) has spiny and shiny sheen on its elytra.
Leaf Beetle (Family Chrysomelidae) belonging to a large and diverse family can grow up to 30mm with many sub-families that can be found in Singapore.
Leaf Beetles do not have antennae that are equal or longer than half the length of their bodies.
The non-venomous spines (up to 4mm) on the prothorax and elytra of these bugs shown in my photo offer them protection, making it hard for predators to swallow.

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